Is there a switch to add for the VERIFY option, so that it doesn't wait 90+ minutes before starting the verification of the .sqb file? Or is the delay in part due to the CHECKSUM that I also have listed as an option for when my Fulls and Diffs kick off?

The database in question is about 265gb in size, and is being compressed. It will show in the activity log that the backup processed successfully, but then it take as long as 90 minutes before starting the VERIFY process. I am guessing that the size of the database is the issue, because I do not see this issue with my smaller databases.

You can include the VERIFYINTERVAL = number in seconds parameter as it was introduced in 6.5.2.9 but this would further delay the time your backup takes. I would expect that the CHECKSUM happens as part of the backup not the verify stage. Red Gate people will confirm this.

If you have Page Verify set to CHECKSUM as a database option I would think the CHECKSUM in the backup could be redundant. True you would need to read every page in the database with Page Verify as CHECKSUM first to know that you had a good database before you run backups without CHECKSUM as all the newly writen pages are CHECKED because of the Page Verify setting.

We have a DB that is about 170Gb of data that we compress with a setting of 2 to 2 files. The backup takes 45 minutes and the verify messages come out 30 minutes later as they only appear at the end of that process.

If I remember correctly you try and compress this database with a level of 4 and haven't been able to complete a backup for at least a week unless that was fixed.

Could you please post the contents of the SQL Backup log file for that backup? . The default folder where the logs are stored is C:\\Documents and Settings\\All Users\\Application Data\\Red Gate\\SQL Backup\\Log\\<instance name> on Windows 2003 and older, and C:\\ProgramData\\Red Gate\\SQL Backup\\Log\\<instance name> on Windows Vista and newer.